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[Discuss-gnuradio] usrp_multi and the USRP2

From: Douglas Geiger
Subject: [Discuss-gnuradio] usrp_multi and the USRP2
Date: Tue, 03 Feb 2009 14:33:15 -0600
User-agent: Thunderbird (Windows/20081209)

 Is there any code similar to usrp_multi.py to use multiple USRP2's
already (or is it unnecessary)? As I understand it, with the USRP2, you
either use the MIMO cable, or an external reference to synchronize the
clocks - then on the host side you would still need to do the
align_on_samplenumbers/deinterleaving, etc. business that usrp_multi.py
took care of for the USRP1.
 If nobody has code available to do this, should I expect any major
hurdles in trying to convert the usrp_multi.py for use with the USRP2
(besides converting the source create calls, removing the subdev calls,
 If I'm using the MIMO cable, do I need to make any additional settings
(e.g. sync_to_pps(True) or similar) to synchronize the master to slave?
http://gnuradio.org/trac/wiki/USRP2GenFAQ says the VCXO locks on to the
external reference, if one exists - which implies this is also the case
for the MIMO cable, just wanted to verify that was true.
 Looking at test_mimo_tx.cc in the u2-mimo-wip branch I see it is
possible to setup one usrp2 interface, and send samples to different
channels - is that accessible from python now - or is it still code
that's in development? If that's the case, is it possible at all to get
synchronized samples out of two usrp2's with a MIMO cable right now with
python, or should I be writing something in C++ to do that for me?

Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University

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